#pragma once 
//cpp或c头文件
#include <iostream>
#include <cstring>
#include <string>
#include <memory>
//系统头文件
#include <sys/types.h>          
#include <sys/socket.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>

#include "Log.hpp"
//宏
// #define PORT 8081
#define BACKLOG 5

class TcpServer
{
  public:
    static TcpServer *getinstance(int port)
    {
        static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
        if(nullptr == _svr)
        {
            pthread_mutex_lock(&lock);
            if(nullptr == _svr)
            {
                _svr = new TcpServer(port);
                _svr->InitServer();
            }
            pthread_mutex_unlock(&lock);
        }
        return _svr; 
    }
    void InitServer()
    {
        Socket();
        Bind();
        Listen();
        LOG(INFO, "tcp_server init ... success!");
    }
    void Socket()
    {
        _listen_sock = socket(AF_INET, SOCK_STREAM, 0);
        if(_listen_sock < 0)
        {
            LOG(FATAL, "socket error!");
            exit(1);
        }
        int opt = 1;
        setsockopt(_listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
        LOG(INFO, "create socket ... success!");
    }
    void Bind()
    {
        struct sockaddr_in local;
        memset(&local, 0, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);
        local.sin_addr.s_addr = INADDR_ANY;

        if(bind(_listen_sock, (sockaddr*)&local, sizeof(local)) < 0)
        {
            LOG(FATAL, "Bind error!");
            exit(2);
        }
        LOG(INFO, "bind socket ... success!");
    }
    void Listen()
    {
        if(listen(_listen_sock, BACKLOG) < 0)
        {
            LOG(FATAL, "Listen error!");
            exit(3);
        }
        LOG(INFO, "listen socket ... success!");
    }
    int Sock()
    {
        return _listen_sock;
    }
    ~TcpServer()
    {
        if(_listen_sock >= 0)
        {
            close(_listen_sock);
        }
    }

  private:
    TcpServer(int port): 
        _port(port), 
        _listen_sock(-1)
    {}
    TcpServer(const TcpServer& s)
    {}
    
  private:
    int _port;
    int _listen_sock;
    static TcpServer *_svr;
};

TcpServer* TcpServer::_svr = nullptr;